【摘要】 针对采煤机滚筒截齿座焊接易发生变形、脱落等问题，以采煤机截齿座焊接处为研究对象，采用SYSWELD构建多层多道焊数值模型，分析截齿座焊缝失效原因，进行不同焊接速度下的应力、应变研究。结果表明：截齿座焊接处最大残余应力与焊接速度正相关，纵向残余应力主要集中在焊缝区且增长速率快于横向残余应力；焊缝焊后变形以横向收缩为主导，变形量随速度增加呈下降趋势；焊接速度降低可有效控制残余应力，但需权衡焊接效率与质量。该研究为提高截齿座焊接质量及快速修复提供了理论依据。更多还原

【Abstract】 To address the problems of weld deformation and detachment in shearer drum pick seats,taking the welding zone of the pick seat as the research object, numerical model of multi-layer multipass welding was established using SYSWELD software to analyze the causes of weld failure and study the stress and strain under different welding speeds. The results show that the maximum residual equivalent stress at the welding zone of the pick seat is positively correlated with the welding speed,with longitudinal residual stress concentrating in the weld zone and increases faster than transverse residual stress. The post-weld deformation of the weld is dominated by transverse shrinkage, and the deformation decreases with the increase of velocity. Lower welding speed can effectively control residual stress but requires efficiency-quality trade-offs. This study provides a theoretical basis for improving welding quality and rapid repair of the pick seat.更多还原